An article is a word used to modify a noun, which is a person, place, object, or idea. It indicates the type of reference being made by the noun. Articles specify grammatical definiteness of the noun.
Technically, an article is an adjective, which is any word that modifies a noun. Usually adjectives modify nouns through description, but articles are used instead to point out or refer to nouns. There are two different types of articles that we use in writing and conversation to point out or refer to a noun or group of nouns: definite and indefinite articles.
Definite Article is the word “the” which refers directly to a specific noun or groups of nouns. It directly and specifically refers to a noun. For example:
Joseph was the first one to finish the race.
Indefinite articles are the words "a” and "an”. Each of these articles is used to refer to a noun, but the noun being referred to is not a specific person, place, object, or idea. It can be any noun from a group of nouns. For example:
An earthen pot looks exquisite.
A pupil should never be given a corporal punishment.